Solid bowl conveyer type centrifuge

Claim 2

A horizontal solid bowl type centrifugal machine adapted to separate a slurry representing a liquid-solids feed mixture into an overflow fraction of centrifugally separated liquid, and a concentrated solids fraction of moist cake consistency, which comprises an external solid bowl having a cylindrical wide end portion providing at the outer end thereof the overflow for said separated liquid fraction, and having a conically constricted end portion extendIng from the inner end of said cylindrical portion, and providing at the outer narrow end thereof for the discharge of said solids fraction, each end of said solid blowl having a hollow trunnion, main bearing means for rotatably supporting said solid bowl, which in turn comprise a first main bearing for the trunnion at the wide end of said bowl, and a second main bearing for the trunnion at the narrow end thereof, coaxial with said first main bearing, a conveyor scroll having a hollow core member concentric with said bowl, extending from end to end thereof, said core member comprising a wide section surrounded by the wide portion of the bowl, and a constricted section surrounded by the conical section of the bowl, scroll conveyor means on said core member, extending substantially from end to end thereof, and cooperating with the surrounding bowl in moving with said solids fraction towards delivery from said narrow end, while the liquid overflows from the opposite end, said core member further having an intermediate transverse partition located about midway between the ends thereof, and further having a radially outwardly directed feed passage opening located at the side of the partition facing said narrow end, and further having radially outwardly directed auxiliary openings located at the opposite side of said partition, a pair of auxiliary bearings supporting the respective ends of said core member for rotation relative to the surrounding bowl, differential drive means for rotating said bowl and said conveyor scroll at a speed differential adapted to move said solids fraction for delivery to said constricted end, while said liquid fraction overflows from said wide end of the bowl, a stationary pipe assembly presenting a substantially cylindrical outer surface, extending coaxially through the trunnion in said first main bearing and through the associated auxiliary bearing into said core member and through said partition, said pipe assembly comprising a slurry feed pipe for delivery of said feed mixture to said discharge opening beyond said partition into the surrounding portion of the solid bowl, and a flush pipe co-extensive and unitary combined with said feed pipe in fixed relationship therewith, and having an outer end portion at the wide end of the bowl, provided with means for connecting said flush pipe to a supply of a flushing fluid, support structure located outwardly from said first main bearing in fixed relationship therewith, for fixedly supporting the outer end portions of said pipe assembly axially aligned with the machine, said pipe assembly normally extending from said support structure through the adjacent trunnion in the adjacent main bearing, and the associated auxiliary bearing, and adapted to be retracted in axially outward direction from said support structure and from said machine, said pipe assembly furthermore being so constructed and arranged that flush fluid is emitted from at least one point of said pipe assembly into said wide section of the core member independently of the passage of slurry through the slurry pipe, and means for controlling the admission of flushing fluid into said auxiliary pipe.

Claim 3

The centrifugal machine according to claim 1, wherein said differential drive means for said solid bowl and said conveyor scroll and disposed at the narrow end of the bowl, and wherein said first main bearing has a housing provided with an outwardly extending axial tubular extension constructed and arranged to provide the fixed support structure for said retractable tube assembly.

Claim 4

A horizontal solid bowl type centrifugal machine adapted to separate a liquid-solids feed mixture into an overflow fraction of centrifugally separated liquid, and a concentrated solids fraction of moist cake consistency, which comprises an external solid bowl having a cylindrical wide end portion providing at the outer end thereof the overflow for said separated liquid fraction, and having a conically constricted end portion exteNding from the inner end of said cylindrical portion, and providing at the outer narrow end thereof for the discharge of said solids fraction, each end of said solid bowl having a hollow trunnion, means bearing means for rotatably supporting said solid bowl, which in turn comprise a first main bearing for the trunnion at the wide end of said bowl, and a second main bearing for the trunnion at the narrow end thereof, coaxial with said first main bearing, a conveyor scroll having a hollow core member concentric with said bowl, extending from end to end thereof, said core member comprising a wide section surrounded by the cylindrical portion of the bowl, and a constricted section surrounded by the conical section of the bowl, scroll conveyor blade means on said core member, extending substantially from end to end thereof, and cooperating with the surrounding bowl in moving said solids fraction towards delivery from said narrow end, while the liquid overflows from the opposite end, said core member further having an intermediate transverse partition located about midway between the ends thereof, and further having a radially outwardly directed feed passage opening located at the side of the partition facing said narrow end, and further having radially outwardly directed auxiliary openings located at the opposite side of said partition, a pair of auxiliary bearings supporting the respective ends of said core member for rotation relative to the surrounding bowl, differential drive means for rotating said bowl and said conveyor scroll at a speed differential adapted to move said solids fraction for delivery to said constricted end, while said liquid fraction overflows from said wide end of the bowl, a stationary feed pipe assembly presenting a substantially cylindrical outer surface, extending coaxially through the associated auxiliary bearing into said core member and through said partition, said pipe assembly comprising a slurry feed pipe for delivery of said feed mixture to said discharge opening beyond said partition into the surrounding portion of the solid bowl, and a flush pipe of much smaller diameter extending internally of said feed pipe and substantially tangential to the inner face thereof, and provided with means for connecting said flush pipe with a supply of a flushing fluid, said flush pipe having emission orifices spaced from one another along the line of tangential contact between said pipes, and registering with corresponding openings provided in said feed pipe, and adapted to emit flush water for flushing sediment from the interior of said core member through said auxiliary openings into the surrounding portion of the bowl, sealing means provided at the juncture of said emission orifices and the respective registering openings and effective to prevent leakage of flushing fluid from the emission orifices of said flush pipe into the surrounding feed pipe, support structure located outwardly from said first main bearing in fixed relationship therewith, for fixedly supporting the outer end portion of said pipe assembly axially aligned with the machine, said pipe assembly normally extending from said support structure through the adjacent trunnion in the adjacent main bearing, and the associated auxiliary bearing, and adapted to be withdrawn in axially outward direction from said support structure and from said machine, and means for controlling the admission of flusing fluid into said auxiliary pipe.

Claim 5

A horizontal solid bowl type centrifugal machine adapted to separate a liquid-solids feed mixture into an overflow fraction of centrifugally separated liquid, and a concentrated solids fraction of moist cake consistency, which comprises an external solid bowl having a cylindrical wide end portion providing at the outer end thereof the overflow for said separated liquid fraction, and having a conically constricted end portion exteNding from the inner end of said cylindrical portion, and providing at the outer narrow end thereof for the discharge of said solids fraction, each end of said solid bowl having a hollow trunnion, means bearing means for rotatably supporting said solid bowl, which in turn comprise a first main bearing for the trunnion at the wide end of said bowl, and a second main bearing for the trunnion at the narrow end thereof, coaxial with said first main bearing, a conveyor scroll having a hollow core member concentric with said bowl, extending from end to end thereof, said core member comprising a wide section surrounded by the cylindrical portion of the bowl, and a constricted section surrounded by the conical section of the bowl, scroll conveyor blade means on said core member, extending substantially from end to end thereof, and cooperating with the surrounding bowl in moving said solids fraction towards delivery from said narrow end, while the liquid overflows from the opposite end, said core member further having an intermediate transverse partition located about midway between the ends thereof, and further having a radially outwardly directed feed passage opening located at the side of the partition facing said narrow end, and further having radially outwardly directed auxiliary openings located at the opposite side of said partition, a pair of auxiliary bearings supporting the respective ends of said core member for rotation relative to the surrounding bowl, differential drive means for rotating said bowl and said conveyor scroll at a speed differential adapted to move said solids fraction for delivery to said constricted end, while said liquid fraction overflows from said wide end of the bowl, a stationary feed pipe assembly presenting a substantially cylindrical outer surface, extending coaxially through the associated auxiliary bearing into said core member and through said partition, said pipe assembly comprising a slurry feed pipe for delivery of said feed mixture to said discharge opening beyond said partition into the surrounding portion of the solid bowl, and a flush pipe of much smaller diameter extending internally of said feed pipe and substantially tangential to the inner face thereof, and provided with means for connecting said flush pipe with a supply of a flushing fluid, said flush pipe having emission orifices spaced from one another along the line of tangential contact between said pipes, and registering with corresponding openings provided in said feed pipe, and adapted to emit flush water for flushing sediment from the interior of said core member through said auxiliary openings into the surrounding portion of the bowl, sealing means provided at the juncture of said emission orifices and the respective registering openings and effective to prevent leakage of flushing fluid from the emission orifices of said flush pipe into the surrounding feed pipe, support structure located outwardly from said first main bearing in fixed relationship therewith, for fixedly supporting the outer end portion of said pipe assembly axially aligned with the machine, said pipe assembly normally extending from said support structure through the adjacent trunnion in the adjacent main bearing, and the associated auxiliary bearing, and adapted to be withdrawn in axially outward direction from said support structure and from said machine, and means for controlling the admission of flusing fluid into said auxiliary pipe.

Claim 6

The centrifugal machine according to claim 3, wherein said sealing means are in the form of weld material applied through said registering orifices, and effective to provide a rigid weld connection between said flush pipe and the surrounding slurry feed pipe.

Claim 7

The centrifugal machine according to claim 3, wherein the feed pipe has drill holes spaced along said line of contact, wherein said flush pipe is fixed to the surrounding feed pipe by means of weld connections through said holes, wherein the orifices are provided by throUghgoing drill holes also on said line of contact, and wherein sealing sleeves are inserted into said throughgoing holes.

Claim 8

The centrifugal machine according to claim 3, wherein said differential drive means for said solid bowl and said conveyor scroll are disposed at the narrow end of the bowl, and wherein said first main bearing has a housing provided with an outwardly extending axial tubular extension constructed and arranged to provide the fixed support structure for said retractable tube assembly.

Claim 9

The tube assembly according to claim 3, wherein the feed pipe has drill holes spaced along said line of longitudinal contract, wherein said flush pipe is fixed to the surrounding feed pipe by means of weld connections through said holes, wherein the orifices are provided by throughgoing drill holes radially through said weld connections, and wherein sealing sleeves are fitted into said throughgoing holes.

Claim 10

A horizontal solid bowl type centrifugal machine adapted to separate a liquid-solids feed mixture into an overflow fraction of centrifugally separated liquid, and a concentrated solids fraction of moist cake consistency, which comprises an external solid bowl having a cylindrical wide end portion providing at the outer end thereof the overflow for said separated liquid fraction, and having a constricted end portion extending from the inner end of said cylindrical portion, and providing at the outer narrow end thereof for the discharge of said solids fraction, each end of said solid bowl having a hollow trunnion, main bearing means for rotatably supporting said solid bowl, which in turn comprise a first main bearing for the trunnion at the wide end of said bowl, and a second main bearing for the trunnion at the narrow end thereof, coaxial with said first main bearing, a conveyor scroll having a hollow core member concentric with said bowl, extending from end to end thereof, said core member comprising a wide section surrounded by the cylindrical portion of the bowl, and a constricted section surrounded by the conical section of the bowl, scroll conveyor blade means on said core member, extending substantially from end to end thereof, and cooperating with the surrounding bowl in moving said solids fraction towards delivery from said narrow end, while the liquid overflows from the opposite end, said core member further having an intermediate transverse partition located about midway between the ends thereof, and further having a radially outwardly directed feed passage opening located at the side of the partition facing said narrow end, and further having radially outwardly directed auxiliary openings located at the opposite side of said partition, a pair of auxiliary bearings supporting the respective ends of said core member for rotation relative to the surrounding bowl, differential drive means for rotating both said bowl and said conveyor scroll at a speed differential adapted to move said solids fraction for delivery to said constricted end, while said liquid fraction overflows from said wide end of the bowl, a stationary feed pipe assembly presenting a substantially cylindrical outer surface extending coaxially through the trunnion in said first main bearing and through the associated auxiliary bearing into said core member and through said partition, said pipe assembly comprising a feed pipe for delivery of said feed mixture to said feed passage opening beyond said partition into the surrounding portion of the solid bowl, and an outer flush pipe concentrically surrounding said feed pipe, said pipes constituting between them an annular jacket space closed at each end, and provided with means for connection to a flush water supply at the outer end, said outer flush pipe having emission openings spaced along the length thereof, and adapted to emit flush water for flushing sediment from the interior of said core member through said auxiliary openings into the surrounding portion of the bowl, support structure located outwardly from said first main bearing in fixed relationship therewith, for fixedly supporting the outer end portions of said pipe assembly axially aligned with the machine, said pipe normally extending from said support structure through the adjacent trunnion, in the adjacent main bearing, and the associated auxiliary bearing, and adapted to be retracted in axially outward direction from said support structure and from said machine, and means for controlling the admission of flush water into said auxiliary pipe.

Claim 11

A horizontal solid bowl type centrifugal machine adapted to separate a liquid-solids feed mixture into an overflow fraction of centrifugally separated liquid, and a concentrated solids fraction of moist cake consistency, which comprises an external solid bowl having a cylindrical wide end portion providing at the outer end thereof the overflow for said separated liquid fraction, and having a constricted end portion extending from the inner end of said cylindrical portion, and providing at the outer narrow end thereof for the discharge of said solids fraction, each end of said solid bowl having a hollow trunnion, main bearing means for rotatably supporting said solid bowl, which in turn comprise a first main bearing for the trunnion at the wide end of said bowl, and a second main bearing for the trunnion at the narrow end thereof, coaxial with said first main bearing, a conveyor scroll having a hollow core member concentric with said bowl, extending from end to end thereof, said core member comprising a wide section surrounded by the cylindrical portion of the bowl, and a constricted section surrounded by the conical section of the bowl, scroll conveyor blade means on said core member, extending substantially from end to end thereof, and cooperating with the surrounding bowl in moving said solids fraction towards delivery from said narrow end, while the liquid overflows from the opposite end, said core member further having an intermediate transverse partition located about midway between the ends thereof, and further having a radially outwardly directed feed passage opening located at the side of the partition facing said narrow end, and further having radially outwardly directed auxiliary openings located at the opposite side of said partition, a pair of auxiliary bearings supporting the respective ends of said core member for rotation relative to the surrounding bowl, differential drive means for rotating both said bowl and said conveyor scroll at a speed differential adapted to move said solids fraction for delivery to said constricted end, while said liquid fraction overflows from said wide end of the bowl, a stationary feed pipe assembly presenting a substantially cylindrical outer surface extending coaxially through the trunnion in said first main bearing and through the associated auxiliary bearing into said core member and through said partition, said pipe assembly comprising a feed pipe for delivery of said feed mixture to said feed passage opening beyond said partition into the surrounding portion of the solid bowl, and an outer flush pipe concentrically surrounding said feed pipe, said pipes constituting between them an annular jacket space closed at each end, and provided with means for connection to a flush water supply at the outer end, said outer flush pipe having emission openings spaced along the length thereof, and adapted to emit flush water for flushing sediment from the interior of said core member through said auxiliary openings into the surrounding portion of the bowl, support structure located outwardly from said first main bearing in fixed relationship therewith, for fixedly supporting the outer end portions of said pipe assembly axially aligned with the machine, said pipe normally extending from said support structure through the adjacent trunnion, in the adjacent main bearing, and the associated auxiliary bearing, and adapted to be retracted in axially outward direction from said support structure and from said machine, and means for controlling the admission of flush water into said auxiliary pipe.

Claim 12

The centrifugal machine according to claim 8, wherein said differential drive means for said solid bowl and said conveyor scroll are disposed at the narrow end of the bowl, and wherein said first main bearing has a housing provided with an outwardly extending axial turbular extension constructed and arranged to provide the fixed support structure for said retractable tube assembly.